Los Angeles is a sprawling city, filled with every type of building imaginable, but what if it were just a bit different? This is the premise behind the recently opened “Never Built: Los Angeles” at the Architecture & Design Museum, a fascinating exhibition focusing on building concepts that were never executed. A sweeping design for LAX from 1952, a heartbreakingly abandoned plan for a massive monorail line, and a hydroponic high-rise are all part of this catalog of could-have-beens, now presented simply as art. From now until October 13, if you’re in L.A. and looking for architectural inspiration, hit up the A & D Museum. —Ashley Churchill